| Abbreviation | Definition |
|---|---|
| SMS | Synchronous Meteorological Satellite |
| SMWG | Synthesis and Modeling Working Group |
| SMZ | Streamside Management Zone |
| SN | Seine Net |
| SNAME | Society of Naval Architects and Marine Engineers |
| SNMM | Above Mean Sea Level (AMSL) |
| SNR | Sonar |
| SO | The Source Of .... |
| SOA | State Oceanic Administration |
| SOAR | Satellite Ocean Analysis for Recruitment |
| SOAR | Somewhere On A River |
| SOBA | System of Operational Buoys in the North Atlantic |
| SOCC | Satellite Operations Control Center |
| SODA | Simple Ocean Data Assimilation |
| SOFAR | Sound Fixing And Ranging |
| SOHO | Solar and Heliospheric Observatory |
| SOI | Southern Oscillation Index |
| SOLERS22 | Solar Electromagnetic Radiation Study for Solar Cycle 22 |
| SOLRAD | Solar Radiation |
| SOLTIP | Solar Connections to Transient Interplanetary Processes |